The purpose of this service is to share your location with friends. The location is requested immediately after login.

Location is only requested after the user has explicitly specified that he/she wants to attach location information to a tweet.

Location is only requested once the user clicks on the "Find my location" button.

Location information is only used for the task for which it was provided

Task: Find your friends on a map and share where you are with the friends you choose.

The Google privacy policy states: [...] we may use the information we collect to:
Provide, maintain, protect, and improve our services (including advertising services) and develop new services. If we use this information in a manner different than the purpose for which it was collected, then we will ask for your consent prior to such use.

Task: Location information is added to individual new Tweets on Twitter.com and via other applications/mobile devices that support this feature.

Task: Submit your location in order to view Flickr images geotagged with locations near you.

Yahoo Privacy Policy states that "Yahoo! may access, store, and use the location information described above to provide location-aware products and services (such as Yahoo! Local), serve advertising, search results, and other content. Other uses of location information may include determining the appropriate language for presenting a website and assisting in the detection of fraud and abuse."

Location information is disposed of when the task is completed, unless expressly permitted

The location information is stored until the user manually deletes it.

The location data is accessible to the users and their specified friends. The Google privacy policy document (http://www.google.com/intl/en/privacy/privacy-policy.html) includes details on protection in the "Information security" section.

Location data is only shared with other users that have been explicitly added (as "Friends"), which falls under the "express permission" definition. The Terms of Service for Google Latitude state that "By using Google's mobile products and services you consent to the collection, use, sharing, and onward transfer of your data." Location data can also be shared with third party applications via the Latitude API under the Google Latitude API Terms of Service.

All tweets with location data attached are retransmitted via Twitter's API and SMS service and made available to third party recipients under Twitter's terms of service http://dev.twitter.com/pages/api_terms

The purpose of collecting the location information is clearly stated in the settings UI.

The purpose of clicking on the button to "Find my location" should be quite clear to the user from the world map context and the already displayed geotagged images there.

The site clearly and conspicuously discloses how long location information is retained

The service history management UI makes it clear that the location data is kept until manually deleted by the user.

From the settings page: "When you tweet with a location, Twitter stores that location. You can switch location on/off before each tweet and always have the option to delete your location history."

No information at all is disclosed to the user.

The site clearly and conspicuously discloses how location information is secured

The location data is accessible to the users and their specified friends. The Google privacy policy document (http://www.google.com/intl/en/privacy/privacy-policy.html) includes details on protection in the "Information security" section.

No information about the security of the data being transmitted (and it is unencrypted).

The site clearly and conspicuously discloses how location information is shared

Location data is only shared with other users that have been explicitly added (as "Friends"). The Terms of Service for Google Latitude state that "By using Google's mobile products and services you consent to the collection, use, sharing, and onward transfer of your data." Location data can also be shared with third party applications via the Latitude API under the Google Latitude API Terms of Service.

All tweets with location data attached are retransmitted via Twitter's API and SMS service and made available to third party recipients under Twitter's terms of service http://dev.twitter.com/pages/api_terms